Improvement in dies for welding chain-links



I..I-I. HELM. DIE FOR WELDING CHAIN-LINKS. iNo. 192,827. PatentedJ'u1y10, 1877.

int/enlarm I J04 (a /62W YW' W UNITED STATES PATENT OFFICE.

JoHN HENRY HELM, on ALLEGHENY, PENNSYLVANIA.

IMPROVEMENT IN DIES FOR WELDING CHAIN-LINKS.

Specification forming part of Letters Patent No. 192,827, dated July 10,1877; application filed May 15, 1875.

To all whom it may concern:

Be it known that I, JoHN HENRY HELM, of Allegheny, in the county ofAllegheny and State of Pennsylvania, have invented certain new anduseful Improvements in Dies for Welding Car and other Links; and I dohereby declare the following to be a full, clear, and exact descriptionof the same, reference being had to the accompanying drawings, making apart of this specification, in which- Figure 1 represents, inperspective, the two parts of the die opened, so as to see the shape andform of the interior. Fig. 2 represents a vertical transverse section orend view of the die as closed, and showing the line of separation of thetwo parts thereof.

My invention relates to an improvement in the construction of two-partdies for welding chain-links; and it relates more particularly to thatform of die wherein the line of separation of the upper andlower die iseither above or below, or partly above and partly below, the center ofthe link to be welded.

The invention consists ina guiding-wall surrounding the die proper, dueto the particular construction of the molded die-surfaces of the twodie-blocks, as I shall proceed to describe.

In the lower or anvil die-block A the U shaped groove f, concave incross-section, is one portion of the die proper, and the correspondinggroove f in the movable die-block B is the other portion. Theline ofparting of the two die sections or blocks intersect the die proper at apoint below the center of the die on the inner side, as shown at c, andabove the center of the die on the outer side, as shown at e, and it isto the direction given to these lines that my improvement is due. Thusthe outer line, starting from the die at a point some distance, asindicated at b, and. then as sumes a horizontal direction, as indicatedat a, while the inner line, starting from a point below the center, at0, takes first a sloping direction downward and outward for somedistance, and then a horizontal direction, as indicated at d.

The advantages of this construction grow out of the circumstance thatrough unwelded link-blanks are never true in shape nor uniform in size,and the wall slopiug down from without to the die on the anvil-blockpermits the blank, if too large for the die, to rest upon it, and yet bein position to be surely guided into the die by the descending upperdieblock. I

On'the upper die are wedge-shaped projections g, which, when the diesare brought together, fit into similarly-shaped recesses h in the lowerdie. These projections and recesses prevent one die from slippinglongitudinally upon the other, as they are apt to do in striking orworking upon the rounded end of thelink that is being welded.

Having thus described my invention, what I claim is- As an improvementin link-welding dies, in which the line of parting of the two die-blocksis broken up into different planes, none of which are coincident withthe plane of the center of the die proper, the external sloping wall 12,substantially as described.

J. HENRY HELM.

Witnesses:

A. B. STOUGHTON, EDMUND MASSON.

